UC2572: Output -200V, input 12V solution

Hi Rock,

It uses external FETs and it should be doable, but we will take a look into this, as this is an old part and we need to study it, too.

Please be noted that we will be able to offer follow-on support next week.  Wish you a happy Thanksgiving!

Regards,

Youhao Xi, Applications Engineering

Hi Youhao,

Thanks! Do we have some new recommand?

Best Regards,

Rock Su

Hi Rock,

This requires to implement an inverting buck-boost and the UCC2572 is still our good choice from our product line.  You just need to design a DCM circuit (by choosing a small inductor) such that the required duty cycle is not limited by the IC's max duty.  I would set the max duty cycle to 75%:

75% > sqrt( 2 x Fsw x Lm x Po) /Vin_min 

By this you select the inductance of Lm at a desired switching frequency Fsw.

Thanks,

Youhao

Hi Youhao,

Thanks a lot!

And the customer wants to know whether we have a more detailed UC2572 datasheet?

The customer wants to have a detailed calculation, such as loop compensation.

Best Regards,

Rock Su